Mechanical brake for vehicles



Vlay 1, 1951 F. R. MCGUIRE MECHANICAL BRAKE FOR VEHICLES 2 Sheets-Sheet1 Filed Oct. 2, 1947 Inventor Frank R. Mc Guire By @M (ma W 19m May 1,1951 F. R. M GUIRE 2,551,448

MECHANICAL BRAKE FOR VEHICLES Filed Oct. 2, 1947 2 Sheets-Sheet 2IIlI/I/IIIII'Vl/II Inventor Frank R. 1140 Gu/re QM WWW y Patented May 1,1951 UNITED STATES PATENT OFFICE 2,551,448 MECHANICAL BRAKE FOR VEHICLESFrank R. McGuire, Maybee, Mich. 7 Application October 2, 1947, SerialNo. 777,511 1 Claim. (01. 188-10) My invention relates to improvementsin mechanical brakes for vehicles, the primary object in view being toprovide four-wheel brake equipment of the type indicated which isgreatly simplified, as compared with brakes as commonly constructed, andwhich is quick acting, but not liable to grab or look, provides for agreater area of braking surface than the usual brakes, and is notsusceptible to undue wear.

Other and subordinate objects within the purview of my invention,together with the precise nature of my improvements, will be readilyunderstood when the succeeding description and claim are read withreference to the drawings accompanying and forming part of thisspecification.

In said drawings:

Figure 1 is a view in perspective illustrating my invention in apreferred embodiment thereof;

Figure 2 is a fragmentary view in vertical longitudinal section taken onthe line 2-2 of Figure 1 and drawn to an enlarged scale;

Figure 3 is a view in perspective of one of the sleeves;

Figure 4 is a similar view of one of the complemental brake disks; and

Figure 5 is a view in transverse section taken on the line 5-5 of Figure2.

Referring now to the drawings by numerals, my improved brakes have beenshown therein, for the purpose of illustrating a preferred embodiment ofthe invention, as applied to the front and. rear wheels 2 of a Vehiclerunning gear, the front wheels I being rotatable on axles, not shown, onsteering knuckles 3 connected by a tubular tie member 4. The rear axles,one of which is shown at 5, are rotatable in the usual rear axle anddifferential housing 6.

According to my invention, the usual brake drums of the front wheels lare each provided on the back thereof with an annular, concentric brakedisk 8 which may be secured to said drum 1 in any suitable manner, andthe usual brake drums 9 of the rear wheels 2 are similarly provided withsimilar brake disks Ill. The brake disks 8, It! are preferably formed ofhard surfaced, polished steel.

Complemental brake disks for the brake disks 8, ID are provided andmounted for cooperation therewith in a manner now to be described.

A pair of externally threaded sleeves one of which is shown in Figures1, 2 and 5, are fixed upon opposite ends of the rear axle anddifferential housing 6 concentrically of the rear wheels 2 by bolts, asat 12, and a pair of similar sleeves,

one of which is shown in Figures 1 and 4 and designated I3, aresimilarly, fixed on the steering knuckles 3 concentrically of the frontwheels I.

A single annular, laterally adjustable brake disk I 4, with aninternally threaded hub I5 is provided on each sleeve l3 on the steeringknuckle 3 with the threads thereof engaging the threads on said sleeve,and brake disks l6, similar to the brake disks M, on internally threadedhubs I! are provided on the sleeves H in the same manner as said disksM, the arrangement of said disks l4, IE on the threaded sleeves l3 beingsuch that by rotation of said hubs l5, l1 reversely of the direction ofrotation of said wheels, in forward travel thereof, the brake disks l4,IE will be screw fed and adjusted toward the brake disks 8, l0 intobraking relation thereto.

Annular brake liners l8, l9 are suitably fixed on the faces of the brakedisks l4, l6, respectively, and which may be formed of any suitablefriction material.

Means are provided for rotating the hubs l5, I! in the describeddirection by depression of the usual brake pedal 2| and comprising thefollowing.

The brake pedal 2| is operatively connected, by a pivoted link 22 andcrank arms 23, to a rock shaft 24, which may be journaled in anysuitable manner on the vehicle to extend transversely thereof and berocked by depression of said pedal 2| in one direction. Crank arms 25 onthe ends of said rock shaft 24 are connected by pivoted pull rods 26 todepending crank arms 21 on the hubs I! so that such rocking of the rockshaft 24 will rotate said hubs I! in the direction described. Crank arms28 on the ends of the rock shaft 24 extending therefrom oppositelyrelative to the crank arms 25 are connected by pivoted pull rods 29 andthe conventional flexible sheath and rod sections 3|] to upstandingcrank arms 3| on the hubs l5, whereby such rocking of the rock shaft 2|will result in rotation of the hubs |5 in the described direction.

As will readily be seen, upon rotation of the hubs l5, I! in thedescribed direction, the brake disks l4, l6 will be screw fed toward thebrake disks 8, I0 into frictional engagement therewith to brake thewheels I, 2. Upon release of the brake pedal 2| and return thereof tonormal position, as by the conventional spring, not shown, the hubs l5,l1 will be rotated in the same direction as the wheels I, 2, in forwardtravel of said wheels, to release the brakes, and this releasing actionwill be facilitated by the rotation of the brake disks 8, I0 by thewheels I, 2, said brake disks 8, l0 being thus rotated in a directiontending to move the brake disks [4, l6 toward releasing position throughfrictional engagement therewith.

The foregoing will, it is believed, suffice to impart a clearunderstanding of my invention, without further explanation.

Manifestly, the invention, as described, is susceptible of modification,without departing from the inventive concept, and right ishereinreserved to such modifications .as fall within the scope of theappended claim.

Having described my claimed as new is:

A brake for a vehicle wheel with abrake drum thereon comprising a brakedisk mounted on said drum outside the same for rotation thereby, acomplemental brake disk for the drum mounted brake disk, means rotatablymounting the complemental brake disk for lateral screw feed ad- Justmentinto and from engagement with the drum mounted brake disk, and pedaloperated means for rotating said complemental brake disk invention, whatis 4 to adjust the same into engagement with said drum mounted disk,said complemental brake disk being rotatable to adjust the same intoengagement with the drum mounted disk reversely relative to thedirection of rotation of said drum mounted disk in forward travel ofsaid wheel, said complemental brake disk being rotatable by said drummounted disk in forward travel of said wheel to disengage said drummounted disk.

FRANK R. MCGUIRE.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,604,060 Matthews Oct. 19, 19261,612,356 Bregoz Dec. 28, 1926 1,718,021 Andrews June 18, 1929 1,795,719Hardison Mar. 10, 1931 1,863,556 Cottrell June 21, 1932 1,928,866Newhart Oct. 3, 1933

